Steam-boiler



m Model) a SheetsSheet 1.

P. PITZGIBBONS;

STEAM BOILER.

No. 354,467. Patented Dec. 14, 1886.-

N PETERS. PhnlwLRhogr-zpher, Walhi nnnnnn C.

(No Model.) 3 Sheets-Sheet 2. P'. PITZGIBBONS.

STEAM BOILER.

No.354,467. Patented'De0.-14,l886.

600 000 000 000 000 QQQ cfo o 00o Q00 o'oocfooooo oooQ ooooo Foooc10ooo(No Model.) 3 Sheets-Sheet 3.

P. FITZGIBBONS.

STEAM BOILER.

N0. 354,467. Patented Dec. 14, 1886.

00009 0000 090000000 OOOOQIOOOO oodoo Q v Yum Kw. "1% if: V ,V Alkali,

UNITED STATES PATENT OFFICE.

PATRICK FITZGIBBONS, OF OSVVEGO, NEW YORK.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 354,467, dated December14, 1886.

Application filed October 23,1886. Serial X0. 217,009. (No model.)

Improvements in Steam-Boilers, of which the following, taken inconnection with the accompanying drawings, is a full, clear, and exactdescription.

This invention relates to the class of steamboilers designatedreturn-flue boilers, and has special reference to such of the aforesaidboilers which have the fire-box formed with a vertical extensionprojecting part way into the boiler proper, and fire flues extendingfrom said fire-box extension to the combustion chamber at thcrear end ofthe boiler.

My present invention consists in a novel construction of a single flue,extending from the fire box extension to the combustion-chamher, asaforesaid, which flue is laterally elongated and occupies the greaterportion of the bottom of the boiler, and thus greatly angments theheatingsurfaces of the boiler, and also affords access for a personthrough the firebox and through the aforesaid fi-uc to thecombustion-chamber, for setting or repairing the ends of the fines inthe rear flue-sheet.

The invention also consists in a peculiar form of the aforesaid flue andits connection with the fire-box extension and combustionchamber, ashereinafter fully described, and specifically set forth in the claims.

In the annexed drawings, Figure 1 is a vertical longitudinal section ofa boiler el nbodying my improvements, and Figs. 2, 3, and 4 are verticaltransverse sections taken, respectively, on lines so a", y 3 and z e, inFig. 1.

Similar letters of reference indicate corresponding parts.

A represents a horizontal cylindrical boilershell, formed at its frontend with water-legs B B, which surround the subjacent fire-box O in theusual manner. The rear end of the the box is formed with the verticalextension 0, which projects part way into the boiler proper.

D denotes the combustion-chamber, which has heretofore been made tocommunicate with the vertical extension 0 of the fire-box by cylindricalflues extended through the boiler, and a a represents the return-finesextending from the combustion chamber through the boiler to the smokebox F 'on the front of the boiler, and H is the smoke-stack, mounted onthe smoke-box in the usual manner.

a a represent short flues extending from the sheet across the back ofthe fire-box extension O and to extend the back flue-sheet, b, to thebottom of the combustion-chamber D, forsupporting the cylindrical fines,and also had to provide the bottom of the combustion-chamher with aman-hole to admit a man, when re quired, for the purpose of setting theflues or repairing the ends of the flues in the flue-sheet b. To obviatethese defects, and at the same time increase the heating-surface of theboiler, I now employ a single flue, L, extending through the water-spaceof the boiler from the vertical extension 0 of the firebox to thecombustionchamber D, the shell of which flue I elongate laterally, so asto occupy the greater portion of the bottom of the boiler proper; and

in order to simplify the construction of said,

flue-and its connection with the fire-box extension 0 andcombustion-chamber D, and at the same time provide the requisite roomfor the rcturn-flues' a a, I form the bottom sheet of the shell of theflue L concave and concentric with the bottom of the boiler proper, andfrom the top sheet of said shell also concave and curve the longitudinalside portions, d (1, thereof reverse and downward,and join the same tothe longitudinal edges of the bottom sheet of said shell.

The bottom sheet of the flueshell I extend to the back sheet, e, of thecombustionchamher and secure it thereto, and thus form the bottom of thecombustion-chamber of the aforesaid extension of the bottom sheet of theflueshell, as shown in Fig. l of the drawings. The top sheet of theflue-shell I extend across the fire-box extension 0 and rivet it to thefront flue-sheet, f, in said extension, and thus form the crown-sheet hof the fire-box extension 0. Said flue L affords convenient access for aper son through the firebox and through the flue to the combustion-chamber, when necessary to set the flues in the flue-sheet b, or torepair the same or any portion of the interior of thecombustion-chamber. The downward deflection of the longitudinal centralportion of the top sheet of the flue-shell enlarges the room over it,for the arrangement of the returnflues a a.

Having described my invention,what I claim as new, and desire to secureby Letters Patent, 1s-- 1. In a return-flue boiler having the rear endof the fire-box formed with a vertical extension projecting part wayinto the boiler proper and the combustion-chamber at the rear end of theboiler, a fireflue extending through the water-space of the boiler from.the

vertical extension of the fire-box to the combustion-chamber, and theshell of said flue laterally elongated to occupy the greater portion ofthe bottom of the boiler, substantially as set forth.

2. In a return-flue boiler having the rear end of the fire-box formedwith a vertical extension projecting part way into the boiler properandthe combustion-chamber at the rear end of the boiler, a fire-flueextending through the water-space of the boiler from the verticalextension of the fire-box to the combustion-chamber, and the shell ofsaid flue laterally elongated, and the bottom sheet of said shellextended to the back sheet of the combustion-chamber to form the bottomof the lat- I ter, substantially as described and shown.

3. In a returnflue boiler having the rear end of the fire-box formedwith a vertical extension projecting part way into the boiler proper andthe combustion-chamber at the rear end of the boiler, a fire-flueextending through the water-space of the boiler from the verticalextension of the fire-box to the combustion-chamber, the shell of saidflue being laterally elongated and the bottom sheet of said shell formedconcentric with the bottom of the boiler and extended to the back sheetof the combustion-chamber to form the bottom of the latter,substantially as described and shown.

4. In a return-flue boiler having the rear end of the fire-box formedwith a vertical extension projecting part way into the boiler proper andthe combustion-chamber at the rear end of the boiler, a fire-flueextending through thewater-space of the boiler from the verticalextension of the firebox'to the combustion-chamber, the shell of saidflue being laterally elongated and the top sheet of said shell extendedacross the vertical extension of the fire-box to form the crown-sheet ofthe latter, substantially as described and shown.

5. In a return-flue boiler having the rear end of the fire-box formedwith a vertical extension projecting part way into the boiler proper andthe combustion-chamberat the rear end of the boiler, a fire-flueextending through the water-space of the boiler from the verticalextension of the fire-box to the com bustion-chamber, the shell of saidflue being laterally elongated and the bottom sheet of said shell formedconcentric with the bottom of the boiler and extended to the back sheetof the combustion-chamber to form the bottom thereof, and the top sheetof said flue-shell extended across the vertical extension of thefire-box to form the crown'sheet of the latter, substantially asdescribed and shown.

6. In a return-flue boiler having the rear end of the fire-box formedwith a vertical extension projecting part way into the boiler proper andthe combustion-chamber at the rear end .of the boiler, a fire-flueextending through the water-space of the boiler from the fire-boxextension to the con1bustion-chamber, the shell of said flue beinglaterally elongated and the bottom sheet of said shell formed concentricwith the bottom of the boiler, and the top sheet of the-flue-shellconcaved and the longitudinal side portions thereof curved reverse anddownward and joined to the longi tudinal edges of the bottom sheet,substantially as described and shown.

In testimonywhereo'f I have hereunto signed my name and afiixed my seal,in the presence of twoattesting witnesses, at Syracuse, in the county ofOnondaga, in the State of New York, this 25th day of September, 1885.

PATRICK FITZGIBBONS. [n s.

Witnesses:

HOWARD P. DENISON, O. H DUELL.

